Luke 13:23-24

Someone said to Him, “Lord, will those who are saved be few?” He said to them, “Strive to enter through the narrow gate.  For many, I tell you will try to enter and will not be able.” 

Jesus is the narrow gate.  The world tries to tell us that there are many ways to get to heaven, but Jesus and salvation is the only way.  Knowing this as Christians increases the strength of our witness to the unsaved.  We know the difference between darkness and light.  The Bible shows us the answers on how to show the unsaved the way.